Strip feeding device



Oct. 31, 1950 R. KRYESKE 2,528,374

I STRIP FEEDING DEVICE Filed May 29, 1948 2 Shgets-Sheet 1 INVENTOR.RAYMOND KRYEsKE Oct. 31, 1950 R. KRYESKE STRIP FEEDING DEVICE 2Sheets-Sheet 2 Filed May 29, 1948 INVENTOR.

RHYMON 0' KRYESKE ,assembly [1, l8, I9, 20 and 2|.

pivot relation at 16 through universal joint [3,.

Patented Oct. 31, 1950 UNITED STATES PATENT OFFICE STRIP FEEDINQVDEVICERaymond Kryeske, Union, N. J. Application May 29, 1948, Serial No.30,105

This invention relates to a feeding device for feeding strip materialinto punch presses and other strip and coil stock fabricating machines.More specifically, it deals with a feeder synchronously driven by thepress and capable of gripping the strip on both sides.

As far as is known, punch presses employing strip stock are fed by hand.This not only requires experienced and skilled operators, but it alsoinvolves laborious manipulation which often causes serious accidents,such as loss of fingers or hands caught in the press tools.

One purpose of the present invention is to provide an. automaticallycontrolled feeding device which will enable a press to employ stripstock by reference to the drawings in which Figure 1 is a side elevationof the slide feed or carriage mechanism as adapted to a punch press.Figure 2 shows an end view of the carriage mechanism shown in Figure 1,while Figure 3 is a plan view of the same carriage mechanism. Anenlarged plan view of the carriage is depicted in Figure 4, while Figurepresents an elevation view of the carriage. An end view of the carriage(with base, lever and stock guides appearing in section) is shown inFigure 6. Figure '7 illustrates an enlarged side elevation of the slipclutch, while an end view thereof, partly in cross-section, is shown inFigure 8. Similar numerals refer to similar parts in the variousfigures.

Referring again to the drawings, and particularly to Figures 1, 2 and 3,numeral 5 represents a base mounted on bolster plate 2 of the powerpress (not shown). On base 5 are mounted positive hold-down bracket 44,carriage 38, slip clutch mechanismlll, stock guides 4|, 42' and 43, andadjustable stock guide plate 32. Power. for operating the carriage istaken from'crankshaft 59 of the power punch press by way of aslideactuating crank disk 28. I

For varying the active'stroke of carriage 38,

crank pin 23 (a threaded T-bolt) has a fine adjustable mounting (T-slot)63 in crank disk' 28. Connected with this adjustable crank pin (throughuniversal joint 25) is adjustable link Connected, in

5 Claims. (Cl. 2712.5)

is rocker lever I2 which is pivoted at its lower end on base 5 at B4.

double taper I60.

Carriage 38 moves in the forward or active direction as shown by thearrow in Figure 1. Wedge I00 of slide 69 spreads apart levers 39 andigrip stock 14. Any further forward motion of 40, thereby causing stockgrippers H and 12 to carriage 38 carries the stock 14 until button 4 of"carriage 38 engages adjustable screw 3 locked in place by nut 60. Asbutton 4 of carriage 38 comes'in contact with adjustable screw 3,positive holddown 4! grips stocks 14 by means of lever 5! pivoted byshouldered screw 53 held in bracket 52. Lever 51 is provided with camfollower 56 at one end. Cam 58, through follower 56, causes adjustableset screw 54, locked by nut v 55, to force rod 5! through quick releaseeccentric pin 48, forcing positive hold-down plunger 41 against stock14, which continues to function until button 8 of carriage 38 contactsadjustable screw 9 held'in place by nut l I, at which instant cam 58allows hold-down plunger 41 to release stock 14 through roll 56 toperform the hold down function. I Movement of slide 69 (Figures 4-6) inrelation 'to carriage 3B is controlledby adjustable screw 61 held inadjustment by nut 66 and the strip stock 14. Adjustable screw 61 buttsagainst pin 65. When a quick release is desired of the stock gripped bygripper jaws H and 12, pin is pulled out laterally all the way, therebyallowing carriage 38 to be moved forward, resulting in release of stock14 by gripper jaws H and 12, making the. stock free for furthermovement.

Should removal of stock 14 be desirable at the time positivehold-down 41(Figures 1-2) is gripping stock 14, quick release lever 49 which isattached to eccentric pin 48 and carries'detent 6| attached to knob 50,is released by pulling knob 50. This releases detent 6| from positivehold-down 41 and by rotating lever 49 approximately allows spring 46 tobring positive end of its forward stroke so that slide 69 may startback, thereby allowing levers 39 and 40 to loosen and release grippingjaws H and 12 from stock 14. The braking effect is obtained at the endof the back stroke of carriage 38, causing the carriage to be heldmomentarily to allow moving forward of slide 59, causing grippers II and12 to grip stock 14 at the proper instant at the commencement of thefeed stroke. As a result, the stock is immediately released at the endof the forward stroke and is positively and firmly gripped at the propermoment (in synchronism with the press) on the commencement of the feedstroke,

thus insuring consistent, accurate feeding of stock M. I

Stock guides M, 42 and 43 guide stock 74 through the feeding mechanism.Stock guide strips ll and 62 are adjustable for different widths ofstock. Span 9'! (Figure 6) for the thickness of the stock is preferablyless than 1.5 times the thickness of stock l4.

Stock guide plate 32 (Figure 1) is keyed to ride in T-slot l8! and hasT-nuts. 33 so that:

shoulder 98 may be easily positioned and act as a guide when pieces ofstock are fed into the feed mechanism.

The slip clutch roll feed stop check (shown in Figures 7-8) is actuatedby drawing power from crankshaft 59 of the power press, using a V-belt3! making a 90 V-belt drive. Sheave 88 rotates on lower roll 85 anddrives roll 85 through friction discs 9! and 93. Plate 94 has a lateralmovement on hub 98 and adjustable pressure is applied to friction disc9| and 93 through spring cap 95 and nut 96. Roll 85 is keyed to gear 83by key 82, said gear driving gear 19 which through Oldham coupling 80and 8| drives shaft 85 mounted in bearings carried in blocks 81. The

shaft 36 and bearings may be raised or lowered to allow for differentthickness of stock M and are easily adjustable by means of stop nut 34and screw 91.

The slip clutch mechanism shown at the right of Figure 8 is able toallow picking up a piece of stock and moving it quickly up against theprevious piece of stock 14 as it is being fed by carriage 38. When thesecond piece 14 butts against the first piece, sheave 88 continues torotate but rolls 85 and 86, which are driven by friction plates SI and93, remain stationary.

time, one behind the other, and carriage 38 is moving in the backwardstroke, the first piece of stock M is held down by the positivehold-down 41 while the second piece 14', which butts up against the endof the first piece, is held from 4 moving back with carriage 38 by theone-way clutch 15,16 and ll.

The term active stroke employedhereinmeans the complete stroke of therocker lever, while the term feed stroke means only the stroke made bycarriage 38.

From the foregoing, it is apparent that the present invention provides asimple and efficient means for feeding strip stock without incurring thewastage encountered with conventional devices. Also, the grippingmechanism requires no need for jaw adjustment and has less opportunityto get out of order.

Although a one-way clutch (Fig. '7) has been described as therestraining means for shaft 85 to insure forward propulsion of thestrip, other restraining means may be used, such as a ratchet device ora brake, or similar mechanism, although the one-way clutch is preferred.

I claim:

1. In a strip feeding device of high accuracy which is synchronouslydriven in forward and return strokes by said machine acting as themoving force, and employing a base, a carriage reciprocating on saidbase with adjustable braking action, which carriage intermittently feedsthe strip into said machine, and a positive holddown for holding thestrip on the return stroke of the carriage, the improvement comprising asmall slide to which the moving force is firmly applied, said slidefitting in parallel, limited floating relation in said carriage andmoving said carriage indirectly, gripping means attached to saidcarriage and acting as a moving means therefor, actuating means attachedto said small slide for actuating said gripping means, linearlydisplaceable adjusting means on said carriage for adjusting the floatingtravel of said small slide to accommodate for small variations inthickarately pivoted gripping member on each side of said stockoppositely disposed to each other forwardly of said pivots and alevering member attached to said gripping member, and said actuatingmeans comprising a separately disposed lever-actuating member attachedto and moved by said small slide and disposed therein to impose aleverage force upon said leverage means during the duration of theforward stroke, whereby the gripping force increases when the resistanceof said stock to forward motion increases.

2. In a strip feeding device synchronously driven by the machine towhich the strip is fed and employing a base, a carriage reciprocating onsaid base with braking action, which intermittently feeds the strip intothe machine and a positive hold-down for holding the strip on the returnstroke of the carriage, the improvement comprising two superimposed andreversibly disposed gripping dogs between which the strips pass and bymeans of which said strips are gripped on both sides as they are movedforward, a shaft projecting laterally from the center of each dog andmounted in the carriage, a lever arm attached to the end of each shaftand acting as means for opening and closing said dog, a tapered wedgedisposed equidistantly between the ends of said levers and carried in asmall slide mounted in the carriage, said wedge acting to close the dogsto grip the strip stock while the small slide is moving forward andrelease said dogs on the reverse stroke, said small slide being capableof moving to a limited ex- 5 tent in parallel relation to the carriage,the forward movement of said small slide being determined by thethickness of said strip Stock, the backward movement, thereof beingdetermined by an adjustable means mounted on said carriage,reciprocating means for reciprocating said small slide within saidcarriage, and engaging means on said small slide for engaging thereciprocating means thereto.

3. A feeding device according to claim 2 in which there is mounted onthe base in back of the carriage a set of gear driven, oppositelyrotated, superimposed, adjustably spaced shafts, the axes of which areat right angles to the strip and which propel the new strip forward, aslip clutch mounted on the lower shaft, a pulley providing power to saidslip clutch from said machine, and retaining means mounted on said lowershaft allowing rotation of said shaft only in the feeding direction ofthe strip.v

4. A feeding device according to. claim 3' in which said restrainingmeans comprises a oneway clutch.

5. A feeding device according to claim 2 in which the carriage hasmounted therein an adjustable set screw in parallel relation thereto anda moveable pin mounted in the small slide, butting up against said setscrew when the carriage is being moved on its backward stroke, themoving of which pin allows additional clearance between the set screwand the small slide, thereby causing, through further movement .of thecarriage, separation of the dogs to facilitate strip removal.

RAYMOND KR-YESKE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 172,715 Dickinson Jan. 25, 1876562,222 Granger June 16, 1896 799,321 Gardner Sept. 12, 1905 1,291,482Greenstreet Jan. 14, 1919 1,447,490 Shellenberger Mar.,6, 1923 1,826,498Bignell Oct. 6, 1931 2,096,073 Spencer Oct. 19, 1937 2,115,131 YanceyApr. 26, 1938 2,250,530 Hafecost July 29, 1941 2,380,320 La France July10, 1945

